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Overall, I think this blog post is a good way to help manage expectations. We might also be hearing official EPA numbers soon and this is just a way to get their story out ahead of time instead of in response to potential backlash.

One quick takeaway from this graph is that the 85kWh Model S is expected to achieve 350-250 miles of range during constant-speed highway driving at 50-70 mph with the conditions listed above.

Click to expand...

Noooice, and it looks like you can get about 225 miles of range @ 80MPH. So 200 @ highway speeds seems to be reasonable.

You can also see that at slower speeds it could even be possible to exceed 400 miles in a Model S under the conditions above. We haven’t internally demonstrated that yet and we are planning a prize for the first customer that actually drives over 400 miles on a single charge.

Awesome blog. You really get the idea that Tesla is not only out to make a profit, but also to make EVs accepted in public by shedding some light on the matter instead of just putting a number out there.
The 400 miles should be doable, although it's very hard for them to confirm it's not done via going down a mountain and/or trailing a truck or something. But I think that's not the point contest

I'd love to see how the Aerodynamic wheels effect the range, if it's more noticeable at higher speeds (it should) etc. A 5% increase would push the figure just above 325 miles @55 mph (assuming it's currently 310 in the blog), and to 210 @ 80 mph. Testing will show that eventually, tho.